Now I'm curious when you show us your metering penta-prism... Well, with that size a penta-mirror will do also.

Well, I haven't found the original one (so far!) A 45 degree finder I would like to have.

Plaubel did not make a Metering Prism for the Makiflexes, but they did make a "Porrofinder" of sorts with first-surface mirrors inside the prism box.

Igor in Cleveland had one for sale (years ago, long gone!). It has SS#'s scratched across the front of it. Should have been quicker, it's the only time I have seen one for sale by itself. I have seen the Plaubel Makiflex 45 degree finders offered with Makiflex camera outfits on German Ebay.